Backflow Laws: Arizona
Arizona Backflow Prevention Laws, Regulations, and Compliance Requirements
Arizona's backflow prevention requirements are governed by Arizona Administrative Code R18-4-215, administered by the Arizona Department of Environmental Quality (ADEQ). Annual testing is mandatory for all required assemblies, with two distinct ADEQ-recognized tester credential categories. This guide covers state law, major utility programs for Phoenix, Tucson, Scottsdale, Mesa, Arizona Water Company, and Liberty Utilities, plus key municipal nuances.
Arizona State Regulatory Framework
The Arizona Department of Environmental Quality (ADEQ) administers Arizona’s drinking water program under EPA primacy and establishes backflow prevention requirements in the Arizona Administrative Code at R18-4-215. Arizona’s program applies to all public water systems serving the state’s 7+ million residents. Cross-connections are prohibited wherever they present potential contamination of the public water supply.
Under R18-4-215, public water systems must protect their distribution systems from backflow at any location presenting an unprotected cross-connection that could contaminate the public water supply. Three categories trigger mandatory protection: facilities where substances harmful to public health could enter via backflow; facilities with non-approved water sources that could backflow; and locations presenting a significant possibility of cross-connection problems. All required assemblies must be testable — non-testable devices do not satisfy ADEQ standards regardless of protection level.
Approved assembly types in decreasing protection order are: air gap (physical separation, not a mechanical assembly), reduced pressure principle (RP/RPZ), double check valve assembly (DCVA), pressure vacuum breaker (PVB), and spill-resistant vacuum breaker (SVB). Assemblies must be listed by the USC Foundation for Cross-Connection Control and Hydraulic Research (USC-FCCCHR) or another ADEQ-approved certification entity.
ADEQ's Two Tester Certification Categories
Arizona has one of the clearest two-tier tester credential structures nationally. General Backflow Testers — certified to conduct required annual tests and post-installation/relocation/repair tests — are the credential held by field contractors. Cross-Connection Control Program Specialists — certified for individuals directly responsible for implementing programs at systems serving over 50,000 — are the utility-level credential. Both must be obtained through ADEQ-approved certifying authorities, including the California-Nevada AWWA section and the Arizona State Environmental Technology Training (ASETT) Center.
Annual Testing and Repair Windows
Annual testing is required for all covered assemblies, plus testing after any installation, relocation, or repair. Test results must be reported to the responsible water utility within 30 days. Failed assemblies must be repaired and retested within windows set by each utility: Phoenix allows 10 days; Tucson requires 5 days (one of the nation’s shortest); most other Arizona utilities allow 15-30 days.
Arizona Plumbing Code — Uniform Plumbing Code
Arizona has adopted the Uniform Plumbing Code (UPC). The UPC governs installation requirements including placement — RPZ and DCVA assemblies may not be installed in below-grade pits or vaults unless adequate clearance and drainage are provided. PVB assemblies must always be installed above ground.
Phoenix's City Ordinance Layer — Chapter 37
Phoenix City Code Chapter 37 creates an additional administrative layer. The Planning and Development (P&D) Director administers all cross-connection provisions of the Phoenix Plumbing Code, determines required assembly types on a case-by-case basis, maintains test records, and as a condition of any building permit, requires appropriate backflow installation. Single-family residences used solely for residential purposes are generally exempt unless a specific hazard is identified.
Major Water Purveyors in Arizona
City of Phoenix Water Services
Phoenix Water Services serves approximately 1.6 million customers — the largest utility in Arizona. Phoenix operates its program under Chapter 37 of the Phoenix City Code. The 10-day repair-and-retest window applies to failed assemblies. Phoenix’s program requires annual testing by ADEQ-certified testers who are approved by Phoenix Water Services. Test reports must be submitted within the utility’s specified timeline. Phoenix cross-connection control applies to all commercial, industrial, medical, institutional, and irrigation connections presenting cross-connection hazards; single-family residences are generally exempt.
Tucson Water
Tucson Water serves approximately 700,000 people in the Tucson area. Tucson Water dispatches Cross-Connection Control Specialists to inspect properties presenting contamination risk and issues compliance notices. Testing notices are mailed approximately 45 days before the annual due date. Critically: only testers who are both ADEQ-certified AND Tucson Water-approved can conduct tests for Tucson Water compliance — being state-certified alone is not sufficient. Tucson requires repairs and passing retest results submitted within 5 days of failure — the shortest repair window among major Arizona utilities. Non-compliance risks non-compliance fees and service interruption.
Auburn Water Resource Management
Auburn Water Resource Management serves the City of Auburn and surrounding areas in Lee County. Auburn’s Backflow Prevention and Cross-Connection Control Policy (latest Auburn revision) is structured around ADEM Chapter 335-7-9 and the Auburn, Alabama Design and Construction Manual. Auburn’s program applies to all commercial and industrial connections and to residential connections with identified cross-connection hazards. Auburn’s policy requires that tester certification meet or exceed AWWA or American Backflow Prevention Association standards. Auburn’s policy specifies that original manufactured parts must be used in all repairs and that the design or operational characteristics of an assembly cannot be changed during repair without prior Board approval.
Arizona Water Company
Arizona Water Company is the largest investor-owned water utility in the state, serving portions of over 50 communities across the Phoenix suburbs and rural Arizona. The utility notifies customers annually when testing is due. Test results must be submitted within 30 days of the test date. Arizona Water maintains a directory of backflow service providers for customer reference but does not endorse any specific provider.
Liberty Utilities (Arizona)
Liberty Utilities serves multiple Arizona communities including Avondale, Palominas, and other areas. Liberty requires annual testing by AWWA-certified testers with results submitted to Liberty and uploaded to the BSI Online platform within their specified deadline. Failed assemblies must be repaired and retested within 15 days.
Scottsdale Water Resources
Scottsdale Water maintains its own approved tester list and requires annual testing for all commercial and institutional assemblies in its service area. Test reports are filed directly with Scottsdale Water. The program covers all commercial, industrial, medical, institutional, and irrigation connections.
Mesa Water Resources
Mesa Water serves approximately 560,000 customers. Mesa’s program is aligned with ADEQ R18-4-215 requirements. Annual testing by ADEQ-certified testers is required, with direct filing to Mesa Water Resources.
Phoenix Metro Suburbs — Peoria, Chandler, Gilbert, Glendale, Tempe, Goodyear
Every Phoenix suburb operates its own utility with its own approved tester list, deadline calendar, reporting platform, and repair window. Property managers with multi-utility portfolios must track program requirements separately for each utility. Confirm annual deadlines directly with each utility — do not assume uniformity across the metro.
Maricopa and Pima County Oversight in Unincorporated Areas
ADEQ has delegated portions of drinking water administration to Maricopa County Department of Environmental Services and Pima County Department of Environmental Quality. Properties in unincorporated areas served by small water systems should confirm their regulatory oversight with both the utility and the relevant county environmental agency.
Property Owner Compliance Summary for Arizona
Annual testing: Required for all covered assemblies by ADEQ-certified testers also approved by your specific water utility.
Report filing: Within 30 days of test (some utilities shorter). Confirm platform with your utility: BSI Online, SwiftComply, or direct submission.
Repair window: Phoenix: 10 days. Tucson: 5 days. Most others: 15-30 days. Know your utility’s specific window.
Placement: RPZ/DCVA not below grade without adequate clearance and drainage. PVB always above ground.
Records: Retain all test reports and repair records.
Find a Certified Backflow Tester in Arizona
Find ADEQ-certified, utility-approved testers at getyourbackflowtested.com/backflow-testing-near-me/arizona-backflow-testing — covering Phoenix, Tucson, Scottsdale, Mesa, and other Arizona communities.
Arizona Regulatory Reference Links
| Resource / Agency | URL / Link Target |
|---|---|
ADEQ — Backflow Prevention & Cross-Connection Control | |
Arizona Administrative Code R18-4-215 | |
City of Phoenix — Backflow Administrative Requirements (Chapter 37) | |
Tucson Water — Backflow Prevention | |
Arizona Water Company — Backflow Prevention | |
Liberty Utilities Arizona — Cross-Connection Control | |
Scottsdale Water Resources — Backflow | |
Mesa Water Resources — Cross-Connection Control |